﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class _Default : System.Web.UI.Page 
{
    protected void Page_Load(object sender, EventArgs e)
    {
      
        if (!Page.IsPostBack)
        {
            NumericTextBox1.ReadOnly = true;
        }
    }
    protected void ChangeIsRequired_Click(object sender, EventArgs e)
    {
        if (NumericTextBox1.IsRequired) NumericTextBox1.IsRequired = false;
        else NumericTextBox1.IsRequired = true;
    }
}
